Renewable fuse



F. N. CONANT.

RENEWABLE FUSE.

APPLICATloN FILED N0v.22,1911.

Patented 001. 11, 1921.

Y nnalaW/WWWW/WWW FRANKLIN N. CoNAN'r, oF NEWBURYPORT, MASSACHUSETTS, ASSIGNOR, BY Masini ASSIGNMENTS, TO THE ('JIl-IIIASE-SHAWMIUT cnUsE'r'rs.

COMPANY, A CORPORATION OF MASSA.-

RENEWABLE FUSE.

To allwhom t may concern.' n

Be it known that I, FRANKLIN N. CoNAN'r, a citizen ofthe United Sta-tes, and a resident of Newburyport, county of Essex, and State of v Massachusetts, have invented an Improvement in Renewable Fuses, of which the following is a specification.

This invention consists of a renewable inclosed fuse of the cartridge type.

Figure l represents a longitudinal section of my fuse taken axially.

Fig. 2 represents a cross-section on the I line 2 2 of Fig. l.

`tion of the ferrule Fig. 3 is a section of a fuse end with the component parts in separated relation.

Fig. 4 is a perspective drawing of the ferrule.

Fig. 5 is a contact plate.

'Fig 6 isa perspective drawing of the end cap. A

Fig. 7 shows a modified form of `ferrule- As here shown, 1 represents the'usual cartridge tube; 2 a ferrule, embracing the end thereof and secured to the cartridge tube by pms 3, in a usual way. This ferrule is of metal, .and is threaded to receive the end cap 11, hereinafter described. The ferrule is preferably fianged to embrace the end of the fuse case, and has an extension 4or 4a across the end 'of the ferrule to form a bearing for the fuse link. Any suitable fuse link may be used having a flat strip terminal, the fuse link 5 here shown being a fiat strip, preferably zinc, in the center. Ends 6 of this fuse link are folded down over the extension 4 or 4 of the ferrule. A plate 7 having a Hat portion 8 and a wedge shaped extension 9, arranged to enter the opening 10 in the end of the ferrule is then placed vin position. The end cap 11 is then screwed to the threaded porperspective drawingv of the portion 9 into .the openin in the ferrule, and jams the plate 7 against the terminal of the link. The wedge shaped extension 9 prevents the rotation of the plate when the l end `cap n is screwed into place, which might injure the delicate link,

and holds the link against` the edge ofthe extension 4 on the Specification of Letters Patent.

having one hole and drives the wedgev 'Patented Oct. 11, 1921.

Application led ltovemher 22, 1917. Serial No.` 203,325.

swer the purpose. This structure has no delicate parts other than the link, andis readily placed in position without screw drlver or other tools, and the contact portions are readily accessible to insure cleaning and a perfect Contact.

If desired, a finely divided non-conducting material may be placed within the tube to improve the action of the fuse on short circuit.

The device without the fusible link is a complete article of manufacture in itself and may be sold to be lled with any suitable link.

I claim:

l. In an inclosed electric fuse of the cartridge type, the combination of a casing containing a fuse strip, an externally screwthreaded metal ferrule for the end of said casing having an end wall formed with an aperture having a straight side, wedging means to engage the fuse strip on the straight side of said aperture throughout its width, and means to engage a terminal portion of the fuse strip on the end wall ad- ]oimng said straight side, both said engaging means being removable. and an end cap arranged to apply pressure to both of sald engaging means to firmly hold the ter- I minalportion of the lfuse strip.

The combination in an inclosed electric fuse of the cartridge type of a casing,

an exteriorly screw-threaded metal ferrule link su porti-ng portion of said ferrule, a

remova lle metal contact plate having a fiat portion and a Wedge portion, the wedge portion entering said aperture and pressing the link sidewise against the edge thereof, and the flatportion coperating with the ink supporting portion to hold the link between them, and a threaded end capscrewed upon the ferrule which presses the contact plate against the fuse link. 3.; The combination, in an inclosed electric fuse of the cartridge type of a casing, an

vexteriorly screw-threaded metal ferrule `for the end ofthe same having a permanent liik` Supporting portion extended transversely of the end of the fuse casing and having an aperture providing abundant space for thel removal of the products of combustion and the insertion of a .fuse link, aiat fuse link arranged longitudinally within the casing and having its terminal portion extended through the aperture and bent over the link su porting portion of said ferrule, a removablie metal contact plate having a flat por-` tion and a wedge portion, the wedge poi'- tion being fitted to enter the aperture 'in the end of the ferrule and pressthe fuse link sidewise against the edge thereof, and the flat portion being arranged to lpress said link against the link supporting portion of tlie ferriile, and a threaded end cap screwed upon the ferrule for applying pressure to said contact'plate. U

4. The combination, in an inclosed electric fuse of the cartridge type of a casing, a metal ferrule for the end of the same, exteriorly screw-threaded, a link supporting portion formed integrally upon the ferrule, and extended transversely o the end of the fuse casing, said link supporting portion having' a substantially semi-circular aperture of an area about one-half of the end of the fuse casing, a ilat fuse link, arranged longitudinally within the fuse casing and having its terminal portion bent over ,the edge of the link supporting portion of said ferrule, a metal contact plate having a flat portion and a wedge portion, the wedge portion bein fitted to enter the aperture -in the end of t e ferrule and press the fusible link sidewise a ainst the link supportin lportion of the errule, and a threaded en cap screwed upon the ferrule which presses' the contact p ate together with its wedge portion against the fusible link. v

5. In an inclosed electric fuse of the cartridge type, the combination of a casing, an

externally screw threaded metal ferrule for the end *of the same having an end wall. formed with an aperture having a straight side, and an adjoining flat contact surface, a

metal contact plate having aboss which A enters the aperture and havin an adjoining fiat contact surface arranged or coperation with the aforesaid contact surface for holdingi a fuse strip therebetween and a threaded en cap screwed onto the ferrule for applying pressure to said contact plate.

6 The combination, in an inclosed electric fuse of the cartridge type of a casing, anI

y externally screw threaded metal ferrule for the end of the saine having an end wall formed with anaperture provided with a straight side,fa flat fuse strip arranged longitudinall 1 withinr the casin and having a termina portion bent over Etghe straight side of the aperture, a metal disk having a wedging portion which entersi the apertureA p and presses the fuse strip sidewise against the straight side of the aperture,v and a externally screw threaded metal ferrule for the end of the saine having an end wall formed with an aperture having a straight side, and an adjoining fiat contact surface, a fuse strip arranged longitudinali within the casing and having av termina portion` bent over'the straight side of the aperture and extended over the flat contact surface, a metal disk having an engaging fportion which enters the aperture and presses the fuse strip' sidewise againstthe straightside of the a erture, and having a flat contact surface or coperation with the aforesaid contact surface and a threaded end cap screwed Iupon the ferrule which presses the disk against' tlie Vfuse strip. A

8. .In an inclosed electric fuse of the cartridge type, the combination of a casing containing a fuse strip, an externally screwthreaded metal ferrule for the end casing, having an apertured end Wall through which a terminal portion of the fuse Astrip projects, a" late having a boss with an inclined side W ich enters the aperture and presses the fuse strip terminal portion firmly against the side of the aperture to insure a good contact and an end cap screwed onto said ferrule -which applies pressure to said plate and boss.

9..' In an inclosed electric fuselofthe car- Y tridge type, the combination of a casing, a

`threaded ferrule for the -end of the same th the wall of'the casing and also havin "a straight side, a fuse strip arranged longitudinall within the casing and having a termina portion bent over the straight side ofthe aperture, a metal disk having a wedging portion which entersthe aperture and presses lthe fuse strip sidewise against said straight side, and a threaded end cap screwed upon the ferrule which presses the disk against the fuse strip on the end wall of the ferrule.

10.'. In an inclosed electric fuse of the cartridge type,the combination of a casing, a threaded metal ferrule for theA end of the same having. an end wallprovided4 with' a semi-circular aperture, said aperture having a circular side concentric with-,the wall of the casing and having a straight side -arranged diametrically with respect thereto, a fuse strip arranged longitudinally within the casing and lhaving a terminal portion bent over the 'Straight side of the aperture on to the'end wall of the iferrule, a metal disk `having an engaging portion of wedge `formation which enters the aperture and lll iso

cap screwed onto the ferrule which presses' the disk against the fuse stripA on the end wall of the ferrule and presses its engaging portion into the aperture. l

l1. In an inclosed electric fuse of the cartridge type, the combination of a casing providedv with axed end wall having an aperture, a fuse striphaving its end portion extended through the aperture, a removable plate arranged over said end wall having a boss which enters the aperture and im pinges the fuse strip against the edge thereof, and a threaded end cap inclosing said plate and applying pressure thereto tohold the fuse strip.

12. In an inclosed electric fuse of the cartridge type, the combination of a casing containing a fuse strip, an annular metal portion exteriorly screw-threaded and provided with a fixed end wall yhaving an aperture, and aremovable plate arranged over said end wall having a boss which enters the aperture and impinges the fuse strip against theedge thereof and also against the end wall, and a threaded end cap inclosing said plate and applying pressure thereto to press it into engagement with the fuse strip.

13. The combination in an inclosed fuse of the cartridge type, of a casing,- a screwthreaded metal ferrule for the end of the same, having a permanent link supporting portion extending transversely of the end of the casing provided with an aperture, a

flat fuse link, arranged longitudinally withand over the link supportlng portion of saidferrule, a removable metal contact member having a fiat portion and a wedge portion, the wedge portion entering said aperture and pressin the link sidewise against the edge thereof and the flat portion coperating with the link supporting portion to hold the llink between them, and a threaded end cap screwed to the ferrule which presses the contact member against the fuse link.

14.-. In an inclosed fuse of the cartridge type, the combination of a casing, a ferrule for the same having a wall formed with an aperture having a straight side and an adjoining flat contact surface, a fuse strip within the Casin a metal contact member having a boss Whlch enters t-he aperture and having an adjoining flat contact surface arranged for coperation with the aforesaid contact surface for holding the fuse strip therebetween and a longitudinally adjustable member for applying pressure to said Contact member.

In testimony whereof, I have signed my name to this specification in the presence of two subscribing witnesses.

FRANKLIN N. CONANT.

Witnesses:

FRANCIS BROWN, HARRY P. Moons. 

